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| Anything that takes up space and has mass. |
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| A substance that cannot be broken down to other substances by chemical reactions. |
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| A substance consisting of two or more different elements combined in a fixed ratio. |
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| Required b an organism in only minute quantities. |
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| The smallest unit of matter that still retains the properties of an element. |
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| A neutral subatomic particle |
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Definition
| A positive subatomic particle. |
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| A negative subatomic particle |
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Term
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Definition
| A dense core where the protons and neutrons are packed tightly together. |
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Definition
| A unit of measurment for atoms and subatomic particles. |
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| The sum of protons plus neutrons in the nucleus of an atom. |
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| An approximation of the total mass of an atom. |
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| The different atomic forms of an element. |
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Definition
| One n which the nucleus decays spontaneously, giving off particles and energy. |
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Definition
| The capacity to cause change |
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Definition
| The energy that matter possesses because of its location or structure. |
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Definition
| An energy level of electrons at a characteristic average distance from the nucleus of an atom. |
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| The outermost electron shell |
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Term
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Definition
| The three-dimentional space where an electron is found 90% of the time. |
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Term
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Definition
| Attractions that result in atoms close together. |
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Definition
| The sharing of a pair of valence electrons by two atoms. |
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Definition
| Two or more atoms held together by covalent bonds. |
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Definition
| A pair of shared electrons |
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Definition
| A notation which represents both atoms and bonding. |
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Definition
| indicating simply that a molecule consists of two atoms of the same atom. |
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Definition
| The attraction of a particular kind of atom for the electrons of a covalent bond. |
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Definition
| Such a bond, in which the electrons are shared equally. |
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Definition
| A covalent bond between atoms that differ in electronegativity. |
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Term
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Definition
| A charged atom or molecule |
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Term
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Definition
| when the charge of an ion is positive |
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Term
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Definition
| the attraction between cation and anions |
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Definition
| Compounds formed by ionic bonds |
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Term
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Definition
| forms when a hydrogen atom covalently bonded to another electronegative atom. |
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Term
| Van der Waals interactions |
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Definition
| Weak attractions between molecules or parts of molecules that result from localized charge fluctuations. |
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Definition
| A starting material in a chemical reaction |
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Definition
| A material resulting from a chemical reaction |
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Definition
| The point at which the reactions offset one another |
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